Toolserver is dead and replaced by toollabs. The toolserver-l list (https://lists.wikimedia.org/mailman/listinfo/toolserver-l) is still around and should be closed down. It hardly has any activity anymore, see https://lists.wikimedia.org/pipermail/toolserver-l/ . The list should not be deleted to keep archives around.
I don't think this needs any discussion, if anyone disagrees, please speak up here. I'll advertise this task on the toolserver-l list.